Get wiring projects done quickly with 3M™ Scotchlok™ Butt Connectors. They're made of electrolytic copper with a tin-plated finish for corrosion resistance and great conductivity, and the seamless, non-insulated barrels have built-in wire stops and chamfered ends for simple stranded wire insertion. These connectors hold up well under high temperatures up to 347 degrees F (175 degrees C).